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EC number: 614-657-1 | CAS number: 68609-08-5
- Life Cycle description
- Uses advised against
- Endpoint summary
- Appearance / physical state / colour
- Melting point / freezing point
- Boiling point
- Density
- Particle size distribution (Granulometry)
- Vapour pressure
- Partition coefficient
- Water solubility
- Solubility in organic solvents / fat solubility
- Surface tension
- Flash point
- Auto flammability
- Flammability
- Explosiveness
- Oxidising properties
- Oxidation reduction potential
- Stability in organic solvents and identity of relevant degradation products
- Storage stability and reactivity towards container material
- Stability: thermal, sunlight, metals
- pH
- Dissociation constant
- Viscosity
- Additional physico-chemical information
- Additional physico-chemical properties of nanomaterials
- Nanomaterial agglomeration / aggregation
- Nanomaterial crystalline phase
- Nanomaterial crystallite and grain size
- Nanomaterial aspect ratio / shape
- Nanomaterial specific surface area
- Nanomaterial Zeta potential
- Nanomaterial surface chemistry
- Nanomaterial dustiness
- Nanomaterial porosity
- Nanomaterial pour density
- Nanomaterial photocatalytic activity
- Nanomaterial radical formation potential
- Nanomaterial catalytic activity
- Endpoint summary
- Stability
- Biodegradation
- Bioaccumulation
- Transport and distribution
- Environmental data
- Additional information on environmental fate and behaviour
- Ecotoxicological Summary
- Aquatic toxicity
- Endpoint summary
- Short-term toxicity to fish
- Long-term toxicity to fish
- Short-term toxicity to aquatic invertebrates
- Long-term toxicity to aquatic invertebrates
- Toxicity to aquatic algae and cyanobacteria
- Toxicity to aquatic plants other than algae
- Toxicity to microorganisms
- Endocrine disrupter testing in aquatic vertebrates – in vivo
- Toxicity to other aquatic organisms
- Sediment toxicity
- Terrestrial toxicity
- Biological effects monitoring
- Biotransformation and kinetics
- Additional ecotoxological information
- Toxicological Summary
- Toxicokinetics, metabolism and distribution
- Acute Toxicity
- Irritation / corrosion
- Sensitisation
- Repeated dose toxicity
- Genetic toxicity
- Carcinogenicity
- Toxicity to reproduction
- Specific investigations
- Exposure related observations in humans
- Toxic effects on livestock and pets
- Additional toxicological data
Hydrolysis
Administrative data
Link to relevant study record(s)
- Endpoint:
- hydrolysis
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- from 2008-07-15 to 2008-08-29
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- EU Method C.7 (Degradation: Abiotic Degradation: Hydrolysis as a Function of pH)
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Radiolabelling:
- no
- Analytical monitoring:
- yes
- Details on sampling:
- Analysis of Samples
The samples were tenfold diluted with the dilution mixture and the content of the test item was determined by the reverse phase HPLC method. - Buffers:
- Buffer solution:
Compositions of the buffer solution: pH 9.0: 107 mL 0.2 M Sodium hydroxide and 250 mL 0.2 M Boric acid and Potassium chloride was diluted to 1000 mL with ultra-pure water. The sterile buffer solution was prepared using reagent grade chemicals and ultra-pure, sterile water. The needed amount was prepared according to the above ratios. The pH of the buffer solution was checked with a calibrated pH meter. - Details on test conditions:
- Preliminary Test
In the course of the preliminary test (Study Code: 07/523-336AN) the test item proved to be hydrolytically unstable at pH 9. Concentration was decreased by about 21 % after 5 days at 50 °C. Thus, main test was performed at pH 9 only.
Main Test
Test 1: The hydrolysis was examined at pH 9 at 50 °C ± 0.5 °C. The test was carried out in triplicate. The Test 1 was started on 17 July 2008. Based on the results of the Test 1, the reaction is considered to be pseudo-first order, therefore, the study was continued with Test 3.
Test 3: The hydrolysis was examined at pH 9 at two temperatures above 50 °C differing from each other by at least 10 °C (55 °C ± 0.5 °C and 67 °C ± 0.5 °C). The reaction solution was analysed at the start of the test and at least three other time points when the degree of hydrolysis was greater than 30 % (for each temperature). The test was carried out in duplicate. Test 3 was started on 13 August 2008.
Test Solutions
Test solutions were prepared by the dilution of the saturated stock solutions. The stock solutions were diluted with the respective buffer solution. The test item concentration in the buffer solutions: Test 1: in the buffer solution pH 9 131 mg/L (0.19 mM), Test 3: in the buffer solution pH 9 119 mg/L (0.17 mM), 2000 mL sterile solution was prepared. Solution was transferred into ~25 mL stoppered tubes. Additionally, control buffer samples were stored at each temperature. The solution was analysed at the start of the tests and then at appropriate time intervals: Test 1: in order to get at least six other data points in the range of 20 to 70 % hydrolysis. Test 3: at least two other data points when the degree of hydrolysis is greater than 30 %.
The hydrolysis was examined at pH value 9.0 in the dark. Temperature: 50 °C ± 0.5 °C, 55 °C ± 0.5 °C, 67 °C ± 0.5 °C.
Light and oxygen: The hydrolysis reaction was carried out using a dark thermostat to avoid photolytic effects. Nitrogen was bubbled into the water for five minutes before the preparation of the solutions in order to exclude oxygen. All glassware, water and buffer solution were sterilised. - Duration:
- 6 d
- pH:
- 9
- Temp.:
- 50
- Initial conc. measured:
- 101 mg/L
- Duration:
- 8 d
- pH:
- 9
- Temp.:
- 50
- Initial conc. measured:
- 98 mg/L
- Duration:
- 14 d
- pH:
- 9
- Temp.:
- 50
- Initial conc. measured:
- 83 mg/L
- Duration:
- 15 d
- pH:
- 9
- Temp.:
- 50
- Initial conc. measured:
- 78 mg/L
- Duration:
- 19 d
- pH:
- 9
- Temp.:
- 50
- Initial conc. measured:
- 66 mg/L
- Duration:
- 25 d
- pH:
- 9
- Temp.:
- 50
- Initial conc. measured:
- 50 mg/L
- Duration:
- 144 h
- pH:
- 9
- Temp.:
- 55
- Initial conc. measured:
- 87 mg/L
- Duration:
- 186 h
- pH:
- 9
- Temp.:
- 55
- Initial conc. measured:
- 80 mg/L
- Duration:
- 210 h
- pH:
- 9
- Temp.:
- 55
- Initial conc. measured:
- 66 mg/L
- Duration:
- 356 h
- pH:
- 9
- Temp.:
- 55
- Initial conc. measured:
- 41 mg/L
- Number of replicates:
- Three replicates.
- Positive controls:
- no
- Negative controls:
- yes
- Remarks:
- control buffer
- Statistical methods:
- Calculations were carried out using “EXCEL for Windows". The calibration curves were constructed with “STATISTICA for Windows" using weighted linear regression. The factor was 1/concentration.
- Preliminary study:
- In the course of the preliminary test (Study Code: 07/523-336AN) the test item proved to be hydrolytically unstable at pH 9. Concentration was decreased by about 21 % after 5 days at 50 °C.
- Transformation products:
- not measured
- % Recovery:
- 78
- St. dev.:
- 101
- pH:
- 9
- Temp.:
- 50 °C
- Duration:
- 6 d
- % Recovery:
- 77
- St. dev.:
- 98
- pH:
- 9
- Temp.:
- 50 °C
- Duration:
- 8 d
- % Recovery:
- 65
- St. dev.:
- 83
- pH:
- 9
- Temp.:
- 50 °C
- Duration:
- 14 d
- % Recovery:
- 61
- St. dev.:
- 78
- pH:
- 9
- Temp.:
- 50 °C
- Duration:
- 15 d
- % Recovery:
- 52
- St. dev.:
- 66
- pH:
- 9
- Temp.:
- 50 °C
- Duration:
- 19 d
- % Recovery:
- 39
- St. dev.:
- 50
- pH:
- 9
- Temp.:
- 50 °C
- Duration:
- 25 d
- % Recovery:
- 73
- St. dev.:
- 87
- pH:
- 9
- Temp.:
- 55 °C
- Duration:
- 144 h
- % Recovery:
- 68
- St. dev.:
- 80
- pH:
- 9
- Temp.:
- 55 °C
- Duration:
- 186 d
- % Recovery:
- 55
- St. dev.:
- 66
- pH:
- 9
- Temp.:
- 55 °C
- Duration:
- 210 d
- % Recovery:
- 35
- St. dev.:
- 41
- pH:
- 9
- Temp.:
- 55 °C
- Duration:
- 356 h
- Key result
- pH:
- 9
- Temp.:
- 50 °C
- Hydrolysis rate constant:
- 0.04 h-1
- DT50:
- 19 d
- Type:
- (pseudo-)first order (= half-life)
- pH:
- 9
- Temp.:
- 55 °C
- Hydrolysis rate constant:
- 0 h-1
- DT50:
- 10 d
- Type:
- (pseudo-)first order (= half-life)
- pH:
- 9
- Temp.:
- 67 °C
- Hydrolysis rate constant:
- 0.01 h-1
- DT50:
- 5 d
- Type:
- (pseudo-)first order (= half-life)
- Key result
- pH:
- 9
- Temp.:
- 25 °C
- Hydrolysis rate constant:
- 0 h-1
- DT50:
- 140 d
- Type:
- (pseudo-)first order (= half-life)
- Remarks on result:
- other: Arrhenius equation
- Validity criteria fulfilled:
- yes
- Conclusions:
- The following half-lives of the test item were determined:
t 1/2 at 25 °C and pH 9: 140 days
t 1/2 at 50 °C and pH 9: 19 days - Executive summary:
The purpose of this study was to evaluate the hydrolysis of the test item at pH value of 9 according to EU Method C.7.
The calculated half lives of the hydrolysis reactions at pH 9 are given in the following table:
Buffer solution Temperature t 1/2 pH 9 25 °C 140 days (3349 hours) pH 9 50 °C 19 days (450 hours)
Reference
Total recovery rate of test substance in (%)
Recovery % | St.dev. | pH | Temp. | Duration |
60 | 71 ± 5 | 9 | 67 | 114 hours |
49 | 59 ± 5 | 9 | 67 | 136 hours |
45 | 53 ± 5 | 9 | 67 | 144 hours |
33 | 39 ± 2 | 9 | 67 | 186 hours |
36 | 44 ± 5 | 9 | 67 | 210 hours |
19 | 22 ± 9 | 9 | 67 | 282 hours |
Description of key information
The purpose of this study was to evaluate the hydrolysis of the test item at pH value of 9. The calculated half-lives of the hydrolysis reactions are 140 days (3349 hours) at temperature 25 °C and 19 days (450 hours) at temperature 50 °C.
Key value for chemical safety assessment
- Half-life for hydrolysis:
- 3 349 h
- at the temperature of:
- 298.2 K
Additional information
The hydrolysis was examined at pH value 9.0 in the dark at different temperatures of 50 °C (± 0.5), 55 °C (± 0.5) and 67 °C (± 0.5). The hydrolysis reaction was carried out using a dark thermostat to avoid photolytic effects. Nitrogen was bubbled into the water for five minutes before the preparation of the solution in order to exclude oxygen. The calculated half lives of the hydrolysis reactions are 140 days (3349 hours) at temperature 25 °C and 19 days (450 hours) at temperature 50 °C.
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